Additions to store-equipment

Hey,

Made a few additions to the store-equipment module,
* Team specific equipment via team attr (json array, allowing multiple teams)
* Different effects for the equipment when a player dies
  * Kill equipment (existing effect)
  * Equipment stays with ragdoll using same attachment position etc, (angle might be weird cuz ragdolls don't have m_angRotation ent prop)
  * Equipment falls/flies off the player with the velocity of the ragdoll when killed (attached to a prop_physics if no physics mesh exists for equipment model, default model is a bucket (invisible) which works for most stuff, also allowed specifying individual models for the physics prop)
  * Env_entity_dissolver on equipment with dissolvetype

NB. only tested with CSS

Let me know what you think